We had a large full glass conservatory built in Dec 08
Heating in it comes from a large radiator. I notices on Saturday that there was a long thin crack on the plaster right above the main opening just under where its attached to the house. On Saturday evening when the weather was a bit cooler the crack had vertually disappeared. I have put it down to the conservatory expanding a bit when its very hot.

Do you think this is the case. Is it anything to worry about??? It is poss to just perhaps sand down plastic a bit and fill and paint????